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The IP.com Prior Art Database

Abstract

Disclosed is a method for using an optical fiber to re-direct light down a hole in the PCB. The fiber is severed at a 45o angle, polished, and mirrored to reflect down the severed end of the fiber. Benefits include a solution that eliminates impedance and power issues, and produces less noise than the current state of the art.

Country

Undisclosed

Language

English (United States)

This text was extracted from a Microsoft Word document.

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This is the abbreviated version, containing approximately
54% of the total text.

Disclosed is a method for using an optical fiber to
re-direct light down a hole in the PCB. The fiber is severed at a 45o
angle, polished, and mirrored to reflect down the severed end of the fiber.
Benefits include a solution that eliminates impedance and power issues, and
produces less noise than the current state of the art.

Background

Current methods for directing light via a fiber rely on mirrors
at a pre-set angle, fixed to a light transmitting pins
or fibers of a fixed length (see Figure 1). Currently, fiber optic technology
is not used in PCBs; all transmission is by electrons through copper or other
conductive metals.

General Description

The following are the stages for creating the disclosed
method:

1. Drill
a hole to access the optical fiber embedded in the resin substrate. The drill
bit should be 45o at the tip (similar to the counter sink drill bit
used for screw heads), and a depth control setting is required (see Figure 2).
The depth of the fiber, the tolerance on the depth of the drill, and the length
of the 45o tip are factors controlled in assuring the fiber is cut
at 45o.

2. Use
plating or metallization to form a small tube in the drilled hole, so when
light is introduced into the hole the resin will not cause it to diffuse or
refract (see Figure 3).

3. Expose
the optical fiber by removing the copper (see Figure 4).

4. The
optical fiber is now in two parts: the part that will reflect the light, and
the section that the light will travel through.
Use a laser to...